Collapsible tire-core



F. L. JOHNSON.

COLLAPSIBLE TIRE CORE. APPLICATION FILED JAN.31. 1920.

1,352,274. 7 Patented Sept 7, 1920.

ATTORNEYS.

UNITED STATES Pmsmm 1 FRANK L. oirnsmv, ornimoiv; 01am.

' COLLAPSIBLE TIRE-CORE.

T 0 all whom it may concern: 7 Be it known that I, FRANK L. JoHNsorna citizen of the United States, residing at Akron, in the county of Summit and btate of Ohio, have invented certain new and .use-

ful Improvements in Collapsible Tire- Cores; and I dorhereby declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

This invention relates to improvements in collapsible the cores for manufacturing outer shoes of double tube pneumatic tires, and the object thereof is to provide a collapsible core which may be quickly assem bled or collapsed, and which when assembled will present the same circle which was formed during the machining of the core.

As is well known, tire cores of necessity,"

must be composed of a. plurality of segments, which are disassembled during theoperation of backing the'core out of the manufactured casing; said segments being assembled prior to the building up of a shoe therefrom, and when united will form an annular core body; the invention more particularly residing in the means whereby the various segments constituting the body por tion of the core are temporarily united.

These and other features of my invention are hereinafter more fully described and pointed out, and are illustrated in the ac companying drawings, in which:

Figure 1, is a side view inelevation, of a tire core having my invention installed thereon.

Fig. 2, is a segmental section on the line 2-2 in Fig. 1, through one of the fastening devices.

In these drawings A, B, B and C indicate d as the lugs g of the clevises overlap the segmental sections of a tire core, which during the process of its manufacture is prefv Specification of Letters Patent. Pag s pt;

Application filed January 31, 1 920. Serial No. 355,349.

C within theradial lugs D, keys F, F and F F are placed; said keysF F and F F being set into themetal of the lugs-D so that-one-half of-the key is embedded in the portion d, and one-halfinthc-portion d of the lugs D. l/Vhile I prefer to position the keys F'and' F 'angularly in said lugs D it is obvious that they may if desired, be otherwise placed, or that cylindrical keys may be used instead of rectangular keys,

as shown in the drawin In practice I prefer to secure the keys I F permanently in the portion (Z of the radial'lug on the segplaced in assembled position,,as shown in ments'A, B, B and C are securedtogether,

ready to have a tire built therethrough, and the clevises G and G are secured on the lugs D by means of pivots which are so positioned radially that the shoulders 03 on the lugs D will be at substantially right angles to the pivots g. H indicates set screws in the clevises G G, which, when the core is assembled, are screwed inwardly against the shoulders 0Z and act to clamp the ends of the segments A, B, B and C firmly against the keys F and F; said keys being of sufficient dimension to maintain spaces between the core sections equal to the thickness of the saw used insawing said segments, so

that the circumference of the core when assembled, will be the same as the machine circumferenceof the core before it was out into segments.

The keys F F are held in place by means of clevises afterthe same are moved to the positions shown by the clevises G and the screws H tightenedv against the shoulders ends of the keys, thereby preventing them After a tire casing has been constructed over the core and vulcanizedthereon, the

screws H are turned backward and the clevises are swung substantially to the po- 7 sition of the clevises G G in Fig. 1, the keys F F are then removed and the segment A is withdrawn inwardly toward the center of the finished tire. The segments B and B are then also withdrawn from the interior of the finished tire, and lastly the segments 0 are removed. The core is then reassembledas hereinbefore described.

Having thus fully shown and described my invention so as to enable others to utilize v the same, What I claim as new and desire to secure by Letters Patent is 1 1. In a collapsible tire-core, the combination of a plurality of segments, keys sunk into the adjoining ends of said segments, clevise's pivoted on said sections and extending acrossfthe adjoining ends of said segments, and set-screws in said clevises adapted to engage the next adjacent segment 7 and clamp the adjoining ends together, substantially asv set forth.

2. In a collapsible tire-core, a plurality 10f lugs on the inner periphery thereof, said bedded inthe adjoining ends of said segments, and clamp members adapted to engage the two portions of each of said lugs and clamp the adjoining ends of said seg ments securely against said keys, substantially as described,

In testimony whereof I aflix signature.

FRANK 'L; JOHNSON; i 

